48 Proceedings of the Biological Society of Washington. 



Scales deciduous anteriorly; in 40 rows from gill opening to caudal base. 



Dorsal rays, excluding anterior rudiments, 13 (13 or 14); anal, 19 (19 or 

 20) . Origin of dorsal midway between end of hypural and middle of snout 

 (or front of orbit); height of dorsal 1.6 (to 1.7) in head, about one-fifth 

 longer than base of fin. Height of anal about equal to length of dorsal 

 base; base of anal as long as distance from middle of eye to insertion of 

 pectoral fin. Pectorals 1.7 (to 1.8) in head, not reaching to pelvic fin; the 

 latter a little longer than half the interspace between pelvic insertion 

 and anal origin, or a little longer than distance from tip of snout to posterior 

 border of pupil. 



Lateral band brilliant and sharply distinct, bordered above with black, 

 narrowed in both directions from the middle of its length; its greatest 

 width equal to length of snout. Sides and lower surfaces of head, and iris, 

 also bright silvery; upper surface of head punctulate, the occiput and nape 

 blackish; vertebral streak consisting of irregular rows of dots before dorsal, 

 and of two blackish streaks behind dorsal, becoming most conspicuous 

 along the upper procurrent caudal rays; no conspicuous punctulations 

 along base of anal fin; caudal dark-edged, the other fins pale. 



3. Cetengraulis mysticetus Gunther. 



Stolephorus opercularis Jordan & Gilbert, Proc. U. S. Nat. Mus., 4, 1881 

 (1882), p. 275 (San Filipe Bay, Lower California; description); Jordan & 

 Evermann, Bull. U. S. Nat. Mus., 47, pt. 1. 1896, p. 445 (after Jordan & 

 Gilbert); Gilbert, Proc. U. S. Nat. Mus., 13, 1890, p. 449 (Panama 

 record). 



Anchovia opercularis Gilbert & Starks, Mem. Calif. Acad. Sci., 4, 1904, 

 p. 42 (after Gilbert). 



Three anchovies, topotypes of Stolephorus opercularis, described from 

 injured specimens, were collected by Edmund Heller at San Filipe Bay, 

 Lower California. Having the branchiostegal membranes broadly united, 

 they are referable to the genus Cetengraulis, and to the species mysticetus 

 of the Panama region. 



These specimens from the Gulf of California confirm the differences 

 which Gilbert & Starks (/. c, p. 47) observed in comparing mysticetus with 

 its Atlantic representative edentulus. The following figures are given for 

 comparison with those published by Gilbert and Starks. 



Measurements in hundredths of length without caudal. 



